Joint for crossing bars.



J. DEGENHARDT.

JOINT FOB. CROSSING BARS? APPLICATION FILED NOV; 5. 1908.

Patented Ma 5; 1914.

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earns JOHANNES DEGENHARDT, OF TEMPELI-IOF, NEAR BER-LIN, GERMANY.

JOINT FOR CROSSING BARS.

To all whom it may concern:

Be it known that I, JOHANNES DEGEN- HARDT, a citizen of the GermanEmpire, residing at Tempelhof, near Berlin, Germany, have inventedcertain new and useful Improvements in Joints for Crossing Bars, ofvwhich the following is a full, clear, and exact description.

My invention relates to improvements in joints for crossing bars, andmore particularly to joints for connecting bars composed to form gratesor lattices for windows.

The object of the improvements is to provide a joint for crossing bars,whereby the bars can rapidly be jointed together to form grates orlattices for windows and the like, and .which gives the grates orlattices so constructed a considerable strength.

A further object of the improvements is to so construct the joints, thatan almost even bearing surface is produced on the upper sides of theflanges of the bars, whereby the window panes can conveniently besupported on the flanges of the bars.

With these objects in view, my invention consists of the elementsdescribed in the following specification and more particularly pointedout in the appended claims, refer- I ence being had to the accompanyingdrawings, in which Figure 1, 1s a plan of a partly composed windowlattice embodying the inventlon,

' Fig. 2, is a plan on an enlarged scale showing in detail the joint ofthe bars forming the grate illustrated in Fig. 1, Fig. 3, 1s a verticalcross-section of the joint taken on the line 33 of Fig. 2, Fig. 4, is avertical cross-sect1on taken on the hue 4 1 of Fig. 3, Fig. 5, is avertlcal cross-section taken on the line .55 of Fig. 2 and illustratinga modification of the form of the flat iron bars and of the cross-stays,Fig. 6, is a cross-section taken on the line 66 of Fig. 5, Fig. 7, is aside view, partly in section, of a modification of the joint, and Fig.8, is a plan illustrating a part of a grate embodying the jointillustrated in Fig. 7.

The same letters of reference have been used in all the views toindicate corresponding parts.

Referring particularly to the example illustrated in Figs. 1 to 4, thegrate or lattice is composed of T-shaped longitudinal iron bars 1extending over the whole length of the grate and of flat iron cross-bars5 and T-shaped cross-stays 6. At the joints, the

Specification of Letters Patent.

Application filed November 5, 1908.

Patented May 5, 1914.

Serial No. 461,167.

the bars 1, and their lengths are preferably equal to the breadth of thelattice. However, if the lattice is very broad, the flat iron bars 5 maybe composed of several sections, in which case, however, the length ofeach section must be larger than thedistance between two consecutivebars 1.. Immediately above the flanges 8 the webs 7 of the cross-stays 6are made hollow, and the said hollow part of the webs must be at leastso high, that the flat iron bars 5 can be passed through the same, andthe flanges 8 must be as thin as possible. For this purpose, thecross-stays 6 are made of sheet metal strips bent together into the formshown in Fig. a. As appears from said figure, the flanges of eachcross-stay are formed of two layers of thin sheet metal, while its webconsists of a tube of rectangular crosssection. The length of theT-shaped crossstays 6 is equal to the distance between two consecutivebars 1, so that, in the grate, the cross-stays abut against the webs 2of the bars 1. When constructing the grate of the bars described, thebars 1 are placed within the proper distances one beside the otheraccording to the lengths of the crossstays 6. Now the cross-stays 6 areplaced between the longitudinal bars 1 with their hollows registeringwith the slots 4 of the bars 1,

sheet metal into the form of a T having a tubular section, the flangescan be madevery thin, so that their surfaces are but slightly higherthan those of the flanges of the bars v1. Thereby the window panes caneasily be supported on the said flanges;

In Figs. 5 and 6, I have shown a modifi cation of the grate in which thecross-bars consisting, in the previously described example, of flat ironand tubular sheet metal pieces, are made in a different way. In thisexample, the fiat iron strips 9 are made with dove-tailedcross-sections, and within the web 10 of the cross-stays 11 acorresponding dove-tailed longitudinal groove 13 is made, which islocated at one side of the web and preferably directly above the flange12. The dove-tailed flat iron strips are slipped into the grooves madewithin the cross-stays 11, whereby a rigid connection is secured. Theflange 12 of the cross-stays is made as thin as possible in the millingprocess; but it must be strong enough to securely bear the window panesupported thereon. Preferably, the form of the slots 14 within the web 2corresponds to the crosssection of the flat iron strips 9, and the slotsare located within such a distance above the flange 3, that thecross-stays 11 when slipped over the flat iron strips bear with theirflanges 12 on the surface of the flanges 3 of the longitudinal bars 1.The grate can be constructed in the same way, as described Withreference to the example illustrated in Figs. 1 to at. Therefore, theclove-tailed flat iron strips 9 are inserted through the slots 1st ofseveral longitudinal bars 1 after placing the cross-stays 11 between thelatter.

The modification shown in Figs. 5 and 6 is preferable in this respect,that the flanges 12 of the Tshaped cross-stays can be made very thin,and the cross-stays as well as the flat iron strips can be manufacturedon an ordinary rolling mill. Therefore the manufacture of the sectionalcross-bars does not require special machines such as are necessary inthe case of the example illustrated in Fig. 4, where such machines arenecessary for bending the sheet metal strips into the form of thecross-stays it.

The connection of the grate elements in the direction of the cross-stays11 is rigid also in such. cases in which the dove-tailed fiat ironstrips do not extend through several cross-stays, but where they aremade of several sections each of which extends a certain distance, intothe dove-tailed groove of two adjacent cross-stays, as shown in Figs. 7and 8. In this case, the flat iron strips 15 are separately pushed intothe grooves 13 of the intermediate pieces 11.

If in the manufacture of window lattices the longitudinal bars 1 are inthe shape of the ordinary T-bars made on the ordinary rolling mills andfound on the market, the abutting faces of each of the cross-stays mustbe cut angular to the direction of the longitudinal axis of the same,and the lower surfaces of the flanges must be made rounded, in order tofit the form of the ordinary T-iron, he web portion of which is strongernear the flanges than at the outer end thereof, and which is maderounded at the corner connecting the web portion and the flange portion.When using T-bars of the form shown in Fig. '4', the cross-stays fit onthe web of the longitudinal bars without having their abutting faces outin the manner described. The web portion 16 of the bars 17, which arepreferably made in the rolling mill, is made thinner near the flangeportion thereof than at the outer margin, so that its cross-section isin the form of a dove-tail. The corner between the web 16 and the flangeportion 18 can be rounded in such a way, that the rolling process is notthereby made more difficult.

By constructing the longitudinal bars as shown in Fig. '4', the centerof gravitation of the bar is located nearer the edge of the web portion,so that the moment of resistance of the bar is increased.

When constructing the grate from the elements described and slipping thecrossstays 6 and 7 or 11 over the Eat iron strips 5 or 9 or 15, untiltheir faces abut against the webs it of the bars 17, a gap 19 is provided between both parts which is filled up by putty when putting in thewindow panes. Therefore, the abutting ends of the cross stays bear withtheir flange portions against the flange portions 18 of the longitudinalbars 17, and with their web portions against the web portions 16 of thesaid bars, whereby a reliable connection of the parts is obtained in thedirection of the cross-stays.

I claim:

1. Ina joint for crossing bars, the combination with a continuous barhaving a slot made in its web portion near its flange portion, raid webportion being thicker at its outer margin than near the flange portionof the bar, of a T-shaped transverse piece, and a flat iron stripextending through said slot and within a hollow made in the web portionof said transverse piece.

2. The combination of a main bar having a flange and a web, a transversebar engaging said web and having a flange adapted to extend over and.rest upon the flange of the main bar, said main bar being provided withan opening extending transversely through its web and said transversebar having a lengthwise extending recess formed in its web and adaptedto register with said opening and a locking strip extending through saidopening into said recess for locking said bars together.

3. In a lattice for windows and the like, the combination withcontinuous parallel flanged bars having registering slots in their webportions directly above their flange portions, of T-shaped cross-staysprovided with recesses arranged between said bars the recesses of saidcross stays registering with said slots, said cross stays bearing withtheir flanges upon the flanges of said bars, and flat iron stripsextending through said slots and into the recesses of said cross-stays.

a. The combination of a main bar having a flange and a web, a transversebar engaging said web and having a flange adapted to extend over andrest upon the flange of the main bar, said main bar being provided witha transverse elongated opening in the web extending away from its flangetoward the free edge of the web and said transverse bar having alengthwise extending recess in its web adapted to register with saidopening and a locking strip extending through said opening into saidrecess whereby said bars are locked together.

5. The combination of a main bar having a flange, a second barprojecting transversely from said main bar and having a flange bearingupon the flange thereof, said main bar being provided with an openingand said second bar having a dove-tail recess extending lengthwisethereof and adapted to register with said opening and a locking striphaving a dove-tail shape in cross-section and adapted to extend throughsaid opening into said recess whereby said bars are locked together.

6. In a joint for crossing bars, the combination of a continuousT-shaped bar provided in its web portion with a slot extendedtransversely through the same, transverse T-shaped sectional barsextendlng from opposlte sides of said continuous bar and each providedin its web portion with a way extion, a metallic member having a webportion and a flange extended therefrom, said web portion having anopening through it, a second metallic member having a web portionprovided with a way extended longitudinally thereof and registering withthe opening in the web of the first-mentioned member, and having aflange extended laterally from said web portion, and a device extendedinto said web and through said opening, for the purpose described.

8. In a lattice for windows and the like, in combination, a plurality ofparallel continuous metallic members, each comprising a web portionhaving a plurality of openings through it spaced apart, and flangesextended on opposite sides of said web portion, a plurality of sectionalmetallic members, each comprising a web portion having a way extendedlongitudinally thereof and flanges extended on opposite sides of saidweb portion, the sectional members being arranged between the continuousmembers with their opposite ends supported by the adjacent flanges oftwo parallel continuous members and with the longitudinal ways in theirweb portions registering with openings in the web portions of saidparallel members, and devices extended into the said longitudinal waysand through the openings in the webs of the continuous members,substantially as described.

In testimony whereof I hereunto aflix my signature in the presence oftwo witnesses.

JOHANNES DEGENHARDT.

Witnesses I IIENRY HASPER, WOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

7 Washington, D. G.

